Instruction 18-10
a Factory Supervisor Is Concerned That the Time

question 75

Multiple Choice

Instruction 18-10
A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds) is too erratic and adversely affects expected profits.The supervisor proceeds by randomly sampling five individuals per hour for a period of 10 hours.The sample mean and range for each hour are listed below.
She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively.
$\begin{array}{ll}\begin{array}{c}\text { Hour }\\\hline1\\2 \\3 \\4 \\5 \\6 \\7 \\8 \\9 \\10\end{array}\begin{array}{r}\overline{X}&R\\\hline{18.4} & 25 \\16.9 & 27 \\23.0 & 30 \\21.2 & 23 \\21.0 & 24 \\24.0 & 25 \\19.3 & 12 \\15.8 & 14 \\20.0 & 13 \\23.0 & 11\end{array}\end{array}$
-Referring to Instruction 18-10,suppose the supervisor constructs an chart to see if the process is in control.Which expression best describes this chart?

• A)Decreasing trend.
• B)Increasing trend.
• C)In control.
• D)Individual outliers.

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Definitions:

Standardization

The process of establishing common standards within an industry to ensure that products and services are consistent and compatible.

Contract Manufacturer

A company hired to produce goods on behalf of another company, under the hiring company's brand name.

Flexible Manufacturing

The direction of machinery by computers to adapt to different versions of similar operations.